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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Sediment flux, wind erosion and net erosion influenced by soil bed length, wind velocity and aggregate size distribution
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Sediment flux, wind erosion and net erosion influenced by soil bed length, wind velocity and aggregate size distribution

机译：土壤床长，风速和骨料尺寸分布影响的沉积物助焊剂，风蚀和净侵蚀

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Knowledge of wind erosion as a dynamic phenomenon changing in space is of importance in measuring and modeling soil erosion. While, many erosion studies have been done on the effect of bed length on wind erosion rate, little attention has been paid to the spatial changes of net erosion rate in different soil bed lengths. The aim of this study is to examine the effect of soil bed length, surface aggregate size distribution and wind velocity on sediment flux and wind/net erosion rates. For this purpose, three soil samples were placed in seven bed lengths ranging from 1 to 7 m and subjected to different wind velocities of 6, 10 and 14 m s(-1) using a wind tunnel. The result showed that total sediment flux increased at longer soil bed lengths, whereas the reverse trend was found for wind erosion and net erosion rates, which was attributed to the gradual saturation of air flow with eroded particles and the formation of armor layer. Depends on soil bed length, the measured wind erosion rate varied from 154.8 to 3783.7 g m(-2) min(-1). Toward the end sections of the bed length, the reduction in net erosion (34.1% to 79.1%) was higher than the reduction in wind erosion rate (18.9% to 50.0%), implying that for every length section, the measured wind erosion rates were higher than the obtained net erosion rates. Soil bed length was found to be an appropriate single variable to predict wind/net erosion rates using a power function. Furthermore, wind erosion rate (Q) was modeled as a function of bed length (L), the mean weight diameter of aggregates (MWD) and wind velocity (V), that was Q = 6 x L-0.225 x MWD-0.579 X V1-975, R-2 = 0.945**. It was also found that the soil containing coarser aggregates exhibited less sediment flux and wind/net erosion rates. The findings of this research revealed that the measurement of wind erosion on different bed lengths under laboratory conditions will result in effective discrepancies in the erosion rates, worldwide; however environmental conditions can be different in areal case. Therefore, it is necessary to pay special attention to the scale effect of soil bed length in future soil erosion studies.
机译：在空间变化的动态现象时，风蚀知识在测量和建模土壤侵蚀方面是重要的。虽然，许多侵蚀研究已经在床长对风腐蚀速度的影响完成，但在不同土壤床长度的净侵蚀率的空间变化中略微关注。本研究的目的是研究土壤床长度，表面骨料大小分布和风速对沉积物通量和风/净侵蚀率的影响。为此目的，将三种土壤样品置于七个床长度范围为1至7μm，并使用风洞对6,10和14m S（-1）的不同风速。结果表明，全沉积物通量在较长的土壤床长时间增加，而逆转趋势被发现用于风蚀和净侵蚀率，这归因于具有侵蚀颗粒的空气流动逐渐饱和和铠装层的形成。取决于土壤床长度，测量的风蚀速率从154.8到3783.7g m（-2）min（-1）变化。朝向床长的末端部分，净侵蚀的减少（34.1％至79.1％）高于风蚀速率的减少（18.9％至50.0％），这意味着对于每个长度部分，测量的风腐蚀速率高于获得的净侵蚀率。发现土壤床长度是使用功率函数预测风/净侵蚀速率的适当单变量。此外，风蚀速率（Q）被建模为床长（L）的函数，聚集体（MWD）和风速（V）的平均重量直径，即Q = 6 x L-0.225 x Mwd-0.579 x V1-975，R-2 = 0.945 **。还发现含有粗聚集体的土壤表现出沉积物助熔剂和风/净侵蚀率较少。本研究的结果显示，在实验室条件下，在不同床长度上的风蚀的测量将导致全球侵蚀率的有效差异;然而，环境条件在面临的情况下可能存在不同。因此，有必要特别注意未来土壤侵蚀研究中的土壤床长度的效果。

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